sS tok_genEqualsAndHashCode(S className, L<Pair<S>> fields) {
  ret [[public bool equals(O o) {
    if (!o instanceof ]] + className + [[) false;
    ]] + className + [[ x = cast o;
    ret ]] + join(" && ", map(fields, func(Pair<S> p) {
      // TODO: use == for primitive fields
      "eq(" + p.b + ", x." + p.b + ")"
    })) + [[;
  }
  
  public int hashCode() {
    int h = ]] + hashCode(className) + [[;
    ]] + concatMap_strings(fields, func(Pair<S> p) {
      "h = h*2+hashCode(" + p.b + [[);
    ]]}) + [[
    ret h;
  }
  ]];
}